Sir, my problem is that generally I forget suddenly whatever I see. E.g. If I go to a mall, I enter from the main gate but I forget what was written on the gate or just side of the gate. And I am also having problem of night fall (seeing sexual dream).Please suggest me. Thanks.

Normally this type of memory issues is because of some psychological problems like Anxiety, Stress, Depression, Attention deficit etc. I need more detail to answer your question in detail.
Night fall is normal and the best treatment for night fall is regular masturbation! Do not think that I’m joking but this is what sexual medicine say. Once you start regular intercourse or masturbation night fall will stop.